Several Factors Affecting the Accuracy of Mass Flow Meter

1. The influence of vibration on the accuracy of mass flowmeter. Solution: Avoid vibration interference. If it is unavoidable, isolation measures should be taken to isolate the flowmeter from the source of vibration interference. 2. The influence of electromagnetic interference on the accuracy of mass flowmeters. Treatment method: The mass flowmeter should be installed away from large transformers, motors and other equipment that generate large magnetic fields. 3. The influence of installation stress on the accuracy of mass flowmeter. Treatment method: a. When installing the flowmeter, strictly abide by the installation specifications. b. After the flowmeter is installed, call up the 'zero adjustment menu' with a handheld operator or on the transmitter interface and record the factory zero preset value. After zero adjustment, observe the zero point value at this time. An order of magnitude, if the difference between the two values ​​is large, it means that the installation stress is too large and should be reinstalled. 4. The influence of gas contained in the oil on the accuracy of the mass flowmeter. Treatment method: a. Improve the working conditions of the oil product so that the bubbles contained in it are distributed as evenly as possible to meet the requirements of normal measurement of the flowmeter; b. Install an air eliminator upstream of the mass flowmeter to minimize gas-liquid mixing; c. Install in strict accordance with the mass flowmeter installation specification: measure the oil medium flow tube and install it downward 5. The influence of temperature changes on the accuracy of the mass flowmeter. Treatment method: a. The influence of temperature on the metal elasticity of the flowmeter measuring tube can be solved by setting the temperature correction coefficient; b. The influence of temperature on the zero point stability, in practical applications, it is necessary to adjust the mass flowmeter under the operating temperature condition. Perform on-site zeroing to minimize the impact. 6. The influence of pressure changes on the accuracy of mass flowmeters. Solution: For oil products with large changes in transfer pressure and custody transfer, it is necessary to install a pressure transmitter downstream of the flow meter to perform real-time pressure compensation in the form of software. 7. The influence of oil density and viscosity on the accuracy of mass flowmeter. Treatment method: The flowmeter should be used to measure oil products with a single or little difference in density. Mass flowmeters used for the transfer of large quantities of oil products must be calibrated online and equipped with an online density meter.

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